package com.tsinghuabigdata.edu.ddmath.commons;

import android.app.Application;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;

import com.tsinghuabigdata.edu.ddmath.util.AppLog;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author victor_freedom (x_freedom_reddevil@126.com)
 * @ClassName: CrashHandler
 * @createddate 2014-12-25 下午11:41:12
 * @Description: UncaughtException处理类, 当程序发生Uncaught异常的时候, 有该类来接管程序, 并记录发送错误报告.
 */
public class CrashHandler implements UncaughtExceptionHandler {

    // CrashHandler 实例
    private static CrashHandler INSTANCE = new CrashHandler();

    // 程序的 Context 对象
    private Context mContext;
    // app对象
    private Application app;

    // 系统默认的 UncaughtException 处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;

    // 用来存储设备信息和异常信息 LinkedHashMap保证插入顺序
    private Map<String, String> infos = new LinkedHashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /**
     * 保证只有一个 CrashHandler 实例
     */
    private CrashHandler() {
    }

    /**
     * 获取 CrashHandler 实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * @param context
     * @param app     传入的app
     * @throws
     * @Title: init
     * @Description: 初始化
     */
    public void init(Context context, Application app) {
        // 传入app对象，为完美终止app
        this.app = app;
        mContext = context;
        // 获取系统默认的 UncaughtException 处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该 CrashHandler 为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当 UncaughtException 发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        // 插入Crash时间
        infos.put("DATE TIME", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").format(new Date()));

        //ex = new Exception(AppLog.wrapMessage(""), ex);
        // 异常处理
        handleException(ex);
        // 如果有默认处理，使用默认的异常处理
        if (mDefaultHandler != null) {
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            // 杀掉进程
            android.os.Process.killProcess(android.os.Process.myPid());
        }
    }

    /**
     * 自定义错误处理，收集错误信息，发送错误报告等操作均在此完成
     *
     * @param ex
     */
    private void handleException(Throwable ex) {
        if (ex == null) {
            return;
        }
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfo2File(ex);
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);

            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            AppLog.i("an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
            } catch (Exception e) {
                AppLog.i("an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中 *
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();

        String result = writer.toString();
        sb.append(result);

        AppLog.c(sb.toString());

/*
        try {
			long timestamp = System.currentTimeMillis();
			String time = formatter.format(new Date());
			String fileName = "error-" + time + "-" + timestamp + ".log";
			if (Environment.getExternalStorageState().equals(
					Environment.MEDIA_MOUNTED)) {
				String path = Environment.getExternalStorageDirectory()
						.getAbsolutePath() + AppConfig.CACHE_DIR + "/crashs";
				//Toast.makeText(mContext, path, Toast.LENGTH_LONG).show();
				File dir = new File(path);
				if (!dir.exists()) {
					dir.mkdirs();
				}
				FileOutputStream fos = new FileOutputStream(path + File.separator + fileName);
				fos.write(sb.toString().getBytes());
				fos.flush();
				fos.close();
			}
			return fileName;
		} catch (Exception e) {
		}
*/
        return null;
    }

}